From the information I could find on that amplifier, it is stable at one ohm and provides 700 W RMS at that resistance. With two four ohm dvc subs you can wire them parallel/parallel for a final load of one ohm.
Hi Hector, if all the wiring is connected properly, you then mite have a problem on the circuit board, or with the subwoofer itself. While its switched off try moving the switches one or two times just in case there is a dry contact. Next would be to take in the unit for an independant bench test before opening the unit. Cheers.
About all you can do if your really wanting to "fix" it, is tear it apart & completely recoil both voice coils.
Otherwise you can just run it on the one good side like a single voice coil sub.
